Introduction: The main purpose of this study was to study the effectiveness of life skill training on reduction of dangerous behaviours among male students, who were at risk, in the city of Kabotarahang. The obtained data were compared in terms of attitude to drug use, depression feeling, assertiveness, self-control and sensation seeking. Methods: The research was a semi experimental study. The statistical population was included all at risk male students, who were educating on the high schools of the city’s outskirts in 2015. All students (50) were divided into two groups: examination (25) and control (25). In order to select the subjects, the multi-stage cluster sampling was used. And, the students were selected randomly among the classes in each school regarding the life and educational and educative status of them using the matched questionnaire of detection of dangerous behaviors. The questionnaire was taken from the RAPI questionnaire. Results: The findings showed that the training of life skills has resulted in a change in at-risk students’ attitude to drug use and a significant decrease in the rate of depression as well as the students’ problems related to assertiveness, self-control and sensation seeking.Conclusion: Generally, it is concluded that life skill training has caused a decrease in dangerous behaviors among the at-risk male students in the city of Kabudarahang.